TY - JOUR
T1 - Asymmetric structure in Sgr A* at 3 mm from closure phase measurements with VLBA, GBT and LMT
AU - Brinkerink, Christiaan D.
AU - Müller, Cornelia
AU - Falcke, Heino
AU - Bower, Geoffrey C.
AU - Krichbaum, Thomas P.
AU - Castillo, Edgar
AU - Deller, Adam T.
AU - Doeleman, Sheperd S.
AU - Fraga-Encinas, Raquel
AU - Goddi, Ciriaco
AU - Hernández-Gómez, Antonio
AU - Hughes, David H.
AU - Kramer, Michael
AU - Léon-Tavares, Jonathan
AU - Loinard, Laurent
AU - Montaña, Alfredo
AU - Mościbrodzka, Monika
AU - Ortiz-León, Gisela N.
AU - Sanchez-Arguelles, David
AU - Tilanus, Remo P.J.
AU - Wilson, Grant W.
AU - Zensus, J. Anton
N1 - Publisher Copyright:
© 2016 The Authors.
PY - 2016/10/21
Y1 - 2016/10/21
N2 - We present the results of a closure phase analysis of 3 mm very long baseline interferometry measurements performed on Sagittarius A* (Sgr A*).We have analysed observations made in 2015 May using the Very Long Baseline Array, the Robert C. Byrd Green Bank Telescope and the Large Millimeter Telescope Alfonso Serrano and obtained non-zero closure phase measurements on several station triangles - indicative of a non-point-symmetric source structure. The data are fitted with an asymmetric source structure model in Sgr A*, represented by a simple two-component model, which favours a fainter component due east of the main source. This result is discussed in light of a scattering screen with substructure or an intrinsically asymmetric source.
AB - We present the results of a closure phase analysis of 3 mm very long baseline interferometry measurements performed on Sagittarius A* (Sgr A*).We have analysed observations made in 2015 May using the Very Long Baseline Array, the Robert C. Byrd Green Bank Telescope and the Large Millimeter Telescope Alfonso Serrano and obtained non-zero closure phase measurements on several station triangles - indicative of a non-point-symmetric source structure. The data are fitted with an asymmetric source structure model in Sgr A*, represented by a simple two-component model, which favours a fainter component due east of the main source. This result is discussed in light of a scattering screen with substructure or an intrinsically asymmetric source.
KW - Accretion, accretion discs
KW - Galaxies: active
KW - Galaxies: jets
KW - Radio continuum: galaxies
KW - Techniques: interferometric
UR - https://www.scopus.com/pages/publications/84988878672
UR - https://www.scopus.com/inward/citedby.url?scp=84988878672&partnerID=8YFLogxK
U2 - 10.1093/mnras/stw1743
DO - 10.1093/mnras/stw1743
M3 - Article
AN - SCOPUS:84988878672
SN - 0035-8711
VL - 462
SP - 1382
EP - 1392
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -